Chapter 1 9
E4428C Analog Signal Generator Overview
Front Panel Overview
14. RF OUTPUT Connector
This female Type-N connector is the output for RF signals. The source impedance is 50Ω. For Options 501,
502, 503, and 504 the damage levels are 50 Vdc, 50 W at ≤ 2 GHz, and 25 W at > 2 GHz maximum. For
Options 501, 502, 503, and 504 the reverse power protection circuit will trip, however, at nominally 1 W.
CAUTION E4428C and E4438C signal generators with Option 506 are not equipped with reverse
power protection circuits.
On signal generators with Option 1EM, this output is relocated to a rear-panel female Type-N connector.
15. Mod On/Off Key
Pressing this hardkey enables or disables all active modulation formats (AM, FM, ΦM, or Pulse) that are
applied to the output carrier signal.
This hardkey does not set up or activate an AM, FM, ΦM, or Pulse format; each individual modulation
format must still be set up and activated (for example,
AM > AM On) or nothing will be applied to the output
carrier signal when the
Mod On/Off hardkey is enabled.
The MOD ON/OFF annunciator, which is always present on the display, indicates whether active modulation
formats have been enabled or disabled with the
Mod On/Off hardkey.
16. RF On/Off Key
This hardkey toggles the operating state of the RF signal present at the RF OUTPUT connector. The
RF On/Off annunciator is always visible in the display to indicate whether the RF is turned on or off.
17. Numeric Keypad
The numeric keypad consists of the 0 through 9 hardkeys, a decimal point hardkey, and a backspace hardkey
( ). The backspace hardkey enables you to backspace or specify a negative value. When specifying a
negative numeric value, the negative sign must be entered prior to entering the numeric value.
18. Incr Set Key
This hardkey enables you to set the increment value of the current active function. When this hardkey is
pressed, the increment value of the current active function appears as the active entry for the display. Use the
numeric keypad, arrow hardkeys, or the knob to adjust the increment value. Changing the Incr Set hardkey’s
value also affects how much each turn of the knob changes an active function’s value according to the
knob’s current ratio setting. For more information on softkeys, refer to the E4428C/38C ESG Signal
Generators Key and Data Field Reference.
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